Schatz JUM/7 beats per minute.

Discussion in '400-Day & Atmos' started by victor miranda, Mar 9, 2019.

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  1. victor miranda

    victor miranda Registered User

    Jan 13, 2017
    319
    30
    28
    computer programming stuff
    Baltimore
    Country Flag:
    Region Flag:
    Forumers,

    As part of my ongoing research into how to get a 400 day clock
    to be more accurate, I obtained a JUM/7.

    I can state both JUM/7 I have do 12 beats a minute.
    This is not the rate of 10 beats as the 400 day clock book states.

    I have two of these clocks here at my house
    they are the same.

    If anyone wants additional documentation
    please let me know and I will add that to this thread.

    victor
     
    etmb61 likes this.
  2. KurtinSA

    KurtinSA Registered User
    NAWCC Member

    Nov 24, 2014
    3,135
    95
    48
    Aerospace Engineer (Ret.)
    San Antonio, TX
    Country Flag:
    Region Flag:
    What is the pendulum weight? I have several but one of them I weighed the pendulum...5 oz. I timed a couple of them...I also get 12 beats per minute.

    Kurt
     
  3. etmb61

    etmb61 Registered User
    NAWCC Member

    Oct 25, 2010
    2,206
    91
    48
    Retired Avionics Technician
    Mascoutah, IL
    Country Flag:
    Region Flag:
    #3 etmb61, Mar 9, 2019
    Last edited: Mar 9, 2019
    Victor,

    Well spotted! The center wheels and 5th wheels are common to the Schatz 53 (10 bpm) and JUM/7, but the escape wheels differ by diameter and the number of teeth. The 53 has 15 teeth and the JUM/7 has 18 teeth.

    Twelve bpm it is! That's suspension unit 10C btw.

    I was just happy to get mine running.

    Eric
     
  4. KurtinSA

    KurtinSA Registered User
    NAWCC Member

    Nov 24, 2014
    3,135
    95
    48
    Aerospace Engineer (Ret.)
    San Antonio, TX
    Country Flag:
    Region Flag:
    So, to confirm, any clock using suspension 10C will exhibit 12 bpm or just this one particular clock, plate 1013B.

    Kurt
     
  5. etmb61

    etmb61 Registered User
    NAWCC Member

    Oct 25, 2010
    2,206
    91
    48
    Retired Avionics Technician
    Mascoutah, IL
    Country Flag:
    Region Flag:
    I'm fairly certain any clock using 10C will be a Schatz JUM/7.

    Eric
     
  6. victor miranda

    victor miranda Registered User

    Jan 13, 2017
    319
    30
    28
    computer programming stuff
    Baltimore
    Country Flag:
    Region Flag:
    Forumers,

    I used the horolovar recommended .0022 wire.
    the pendulum weighs in at 4.9 oz or masses 139 grams.
    the bottom cover is off on my particular one so that I can lock it.
    so It may be a little lighter than normal Jum/7 bobs.

    victor
     

Share This Page